#include "stdio.h"
#include "string.h"

int main(){
    int n=0;
    scanf("%d",&n);
    int count = 0;
    while (n!=1){
        if(n%2==0){
            n = n/2;
        } else{
            n = (3*n+1)/2;
        }
        count++;
    }
    printf("%d\n",count);
    return 0;
}